When two tornadoes with opposite rotating directions collide, it would create an extremely rare phenomenon known as an anticyclonic tornado.
Typically, tornadoes rotate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. These are called cyclonic tornadoes. However, if two tornadoes with opposing directions come into contact, their vortices may merge and interact, leading to the formation of an anticyclonic tornado.
An anticyclonic tornado rotates in the opposite direction compared to a typical tornado. Instead of the usual upward motion, an anticyclonic tornado moves downward from the cloud base toward the ground. They are relatively rare and often weaker compared to their cyclonic counterparts.
When two tornadoes collide, the interaction between their vortices can be complex. The merging vortices may cancel each other out or combine, resulting in a new, potentially modified tornado. The behavior and outcome of this collision would depend on various factors such as the strength and size of the tornadoes, the angle of collision, and other environmental conditions.
It's worth noting that tornadoes are highly dynamic and chaotic weather phenomena, and predicting their behavior and the exact outcome of a collision is challenging. Weather scientists and meteorologists continue to study tornadoes to gain a better understanding of their formation, behavior, and interactions.